reporter on deadline seeks comment about reported security bug in FreeBSD

Dan Goodin dgoodin at
Mon Sep 14 19:45:43 UTC 2009


Dan Goodin, a reporter at technology news website The Register. Security
researcher Przemyslaw Frasunek says versions 6.x through 6.4 of FreeBSD
has a security bug. He says he notified the FreeBSD Foundation on August
29 and never got a response. We'll be writing a brief article about
this. Please let me know ASAP if someone cares to comment.

Kind regards,

Dan Goodin

-------- Original Message --------
Subject: Re: [Full-disclosure] FreeBSD <= 6.1 kqueue() NULL pointer
Date: Sun, 13 Sep 2009 10:49:33 +0200
From: Przemyslaw Frasunek <venglin at>
To: full-disclosure at, bugtraq at
References: <4A9028AC.9080902 at>

Przemyslaw Frasunek pisze:
> FreeBSD <= 6.1 suffers from classical check/use race condition on SMP

There is yet another kqueue related vulnerability. It affects 6.x, up to
6.4-STABLE. FreeBSD security team was notified on 29th Aug, but there is no
response until now, so I won't publish any details.

Sucessful exploitation yields local root and allows to exit from jail.
For now,
you can see demo on:

* Fido: 2:480/124 ** WWW: ** NICHDL: PMF9-RIPE *
* Jabber ID: venglin at ** PGP ID: 2578FCAD ** HAM-RADIO: SQ5JIV *

Full-Disclosure - We believe in it.
Hosted and sponsored by Secunia -

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